package com.apple.controller;

import com.apple.common.BaseContext;
import com.apple.common.R;
import com.apple.entity.ShoppingCart;
import com.apple.service.ShoppingCartService;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

/**
 * 购物车
 * */
@Slf4j
@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {
    @Autowired
    private ShoppingCartService shoppingCartService;
    /**
     * 添加购物车
     * @param shoppingCart
     * @return
     * */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart) {
        log.info("购物车数据:{}", shoppingCart);
        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        //查询菜品或者套餐是否在购物车中，如果在数量加一，不在添加到购物车中数量默认为1
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, currentId);
        if (dishId != null) {
            //添加到购物车中的是菜品
            queryWrapper.eq(ShoppingCart::getDishId, shoppingCart.getDishId());

        }else {
            //添加到购物车中的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
        }
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        if (cartServiceOne != null) {
            //如果已经存在，数量加一
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
            //如果不存在，添加到购物车中
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }
    /**
     * 查看购物车
     * @return
     * */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list() {
        log.info("查看购物车...");
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);
        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
        return R.success(list);
    }
    /**
     * 清空购物车
     * @return
     * */
    @DeleteMapping("/clean")
    public R<String> clean() {
        //SQL:delete from shopping_cart where user_id = ?
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
        shoppingCartService.remove(queryWrapper);
        return R.success("清空购物车成功");
    }
    /**
     * 减少购物车
     * @return
     * */
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart) {
        log.info("购物车数据:{}", shoppingCart);
        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        //根据用户id查询购物车中菜品或套餐，执行减少购物车后判断菜品或套餐的数量是否大于0，如果大于0，则减少，如果小于0，则删除
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, currentId);
        if (shoppingCart.getDishId() != null) {
            //减少的是菜品
            queryWrapper.eq(ShoppingCart::getDishId, shoppingCart.getDishId());
        }else {
            //减少的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
        }
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        if (cartServiceOne == null) {
            return R.error("减少购物车失败");
        }
        //判断菜品或套餐的数量是否大于0，如果大于0，则减少，如果小于0，则删除
        if (cartServiceOne != null) {
            Integer number = cartServiceOne.getNumber();
            if (number > 1) {
                //数量减一
                cartServiceOne.setNumber(number - 1);
                shoppingCartService.updateById(cartServiceOne);
            }else {
                //数量为0，删除
                shoppingCartService.removeById(cartServiceOne.getId());
            }
            return R.success(cartServiceOne);
        }
        return R.error("减少购物车失败");
    }

}
